mineral

Crazy Lace Agate

Banded Chalcedony (Microcrystalline Quartz, SiO2)

Hardness: 6.5–7 (Mohs scale); Color: Cream, tan, grey, and golden-brown with complex banding; Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.6–2.65.

Hardness: 6
Color: Cream, tan, grey, and golden-brown with complex banding
Luster: Waxy to vitreous

Identified March 10, 2026More mineral →

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Physical properties

Formation & geological history

Formed in the Cretaceous period (approx. 65-90 million years ago) through the deposition of silica-rich fluids in volcanic rock cavities. The complex 'lace' patterns result from fluctuating iron and aluminum levels during the rhythmically repeating precipitation of silica layers.

Uses & applications

Primarily used in jewelry making (cabochons, beads), decorative carvings, and as a popular specimen for lapidary collectors due to its unique patterns.

Geological facts

Often called 'The Laughter Stone' or 'Mexican Lace Agate,' it is geographically restricted to a specific area in Chihuahua, Mexico. Famous for its 'fortification' patterns that resemble stone walls in an aerial view.

Field identification & locations

Identify in the field by looking for distinct, swirling concentric bands and a waxy luster on fractured surfaces. It is most commonly found as nodules or seam fillings in limestone or volcanic host rocks in Northern Mexico. Collectors should look for high contrast and tight 'eyes' in the banding.

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